Production of silver-coated copper-based powders

Details Production of silver-coated copper-based powders Production of silver-coated copper-based powders

1991-07-17

1993-01-12

Lusignan, Michael

Coating processes

Particles, flakes, or granules coated or encapsulated

Inorganic base

427125, 427217, 427343, B05D 724

Patent

active

051789094

ABSTRACT:
Silver-coated copper-based powders are prepared by the steps of dispersing copper powders in a chelating agent solution, adding a silver ion solution to the resulting dispersion to effect a substitution type of deposition reaction and, then, adding a reducing agent to the resulting solution to effect a reduction type of deposition reaction, thereby forming silver coats on the surfaces of the copper powders, wherein the chelating agent solution is prepared in two portions, a first portion thereof being prepared before the addition of the silver ion solution and a second portion thereof being added during the addition of the reducing agent, or in three portions, a first portion thereof being prepared before the addition of the silver ion solution, a second portion thereof being added during the addition of the reducing agent and a third portion thereof being added at the time of the completion of the reaction.

REFERENCES:
patent: 4652465 (1987-03-01), Koto et al.

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